should not use them for communication between trusted and untrusted code.

6.  For the mainline flavor, we test the libraries using OpenJDK 8, 11, and 17
    on Linux, with some additional testing on newer JDKs and on Windows. Some
    features, especially in `com.google.common.io`, may not work correctly in
    non-Linux environments. For the Android flavor, our unit tests also run on
    API level 23 (Marshmallow).

import static com.google.common.base.StandardSystemProperty.PATH_SEPARATOR;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.collect.ImmutableList;
import com.google.common.testing.GcFinalization;
import java.io.File;
import java.lang.ref.WeakReference;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.net.MalformedURLException;
import java.net.URL;

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import junit.framework.TestCase;

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import junit.framework.TestCase;

import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableClassToInstanceMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.NullPointerTester.Visibility;
import com.google.common.util.concurrent.RateLimiter.SleepingStopwatch;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;

import static org.junit.Assert.assertThrows;

import com.google.common.collect.ImmutableClassToInstanceMap;
import com.google.common.collect.ImmutableSet;
import com.google.common.testing.NullPointerTester;
import com.google.common.testing.NullPointerTester.Visibility;
import com.google.common.util.concurrent.RateLimiter.SleepingStopwatch;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;

    static abstract class BaseCreds implements SmbRenewableCredentials {
        @Override
        public CredentialsInternal clone() {
            // For testing purposes, return this instance (allowed by return type)
            return this;
        }

        @Override

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.util.concurrent.testing;

import static com.google.common.util.concurrent.MoreExecutors.newDirectExecutorService;
import static java.util.concurrent.Executors.callable;

import com.google.common.annotations.GwtIncompatible;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.util.concurrent.testing;

import static com.google.common.util.concurrent.MoreExecutors.newDirectExecutorService;
import static java.util.concurrent.Executors.callable;

import com.google.common.annotations.GwtIncompatible;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.collect.Synchronized.SynchronizedCollection;
import com.google.common.collect.Synchronized.SynchronizedSet;
import com.google.common.testing.SerializableTester;
import java.io.Serializable;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import junit.framework.TestCase;